The couple are expecting a baby, their first child, in May.
The happy occasion was shared by aunt-to-be Heidi Montag, who had Tweeted a link to a photo of her older sister and brother-in-law, posing in front of a Christmas tree with Holly gently cradling her baby bump.
"Couldn't be happier for my sister @hollymontag Christmas miracle!!!!!" she wrote. "Love you!!!," the Marriage Boot Camp star wrote of her excitement.
Holly, 31, and Wilson tied the knot in September in Crested Butte, Colorado.